package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

public class JDBCLogin {
    /**
     * 登录功能
     * 用途输入用户名和密码
     * 返回结果
     *  1.登录成功，欢迎 + 用户名
     * */
    public static void main(String[] args) {
        try(Connection connection = DBUtil.getConnection())
        {
            Statement statement = connection.createStatement();
            Scanner scanner = new Scanner(System.in);
            System.out.println("用户名");
            String username = scanner.nextLine();
            System.out.println("密码");
            String password = scanner.nextLine();
            
            String sql = "SELECT nickname, password FROM userinfo WHERE username='"+username+"' AND password = '"+password+"'";
            ResultSet r = statement.executeQuery(sql);
            // 判断
            if(r.next()){
                String nickname = r.getString("nickname");
                System.out.println("登陆成功，欢迎您"+nickname);

            }else {
                System.out.println("用户名或密码错误");
            }

        }catch (SQLException e)
        {
            throw new RuntimeException(e);
        }
    }
}
